/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.it.query;

import org.apache.iotdb.db.mpp.common.header.ColumnHeaderConstant;
import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.ClusterIT;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;
import org.junit.AfterClass;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.sql.*;

import static org.apache.iotdb.db.it.utils.TestUtils.prepareData;
import static org.apache.iotdb.db.it.utils.TestUtils.resultSetEqualTest;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.fail;

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class, ClusterIT.class})
public class IoTDBResultSetIT {

    private static final String[] SQLs =
            new String[]{
                    "CREATE DATABASE root.t1",
                    "CREATE TIMESERIES root.t1.wf01.wt01.status WITH DATATYPE=BOOLEAN, ENCODING=PLAIN",
                    "CREATE TIMESERIES root.t1.wf01.wt01.temperature WITH DATATYPE=FLOAT, ENCODING=RLE",
                    "CREATE TIMESERIES root.t1.wf01.wt01.type WITH DATATYPE=INT32, ENCODING=RLE",
                    "CREATE TIMESERIES root.t1.wf01.wt01.grade WITH DATATYPE=INT64, ENCODING=RLE",
                    "CREATE TIMESERIES root.t1.wf01.wt02.status WITH DATATYPE=BOOLEAN, ENCODING=PLAIN",
                    "CREATE TIMESERIES root.t1.wf01.wt02.temperature WITH DATATYPE=FLOAT, ENCODING=RLE",
                    "CREATE TIMESERIES root.t1.wf01.wt02.type WITH DATATYPE=INT32, ENCODING=RLE",
                    "CREATE TIMESERIES root.t1.wf01.wt02.grade WITH DATATYPE=INT64, ENCODING=RLE",
                    "CREATE TIMESERIES root.sg.dev.status WITH DATATYPE=text,ENCODING=PLAIN",
                    "insert into root.sg.dev(time,status) values(1,3.14)"
            };

    private static final String[] emptyResultSet = new String[]{};

    @BeforeClass
    public static void setUp() throws Exception {
        EnvFactory.getEnv().initBeforeClass();
        prepareData(SQLs);
    }

    @AfterClass
    public static void tearDown() throws Exception {
        EnvFactory.getEnv().cleanAfterClass();
    }

    @Test
    public void intAndLongConversionTest() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "insert into root.t1.wf01.wt01(timestamp, status, type, grade) values (1000, true, 1, 1000)");
            statement.execute(
                    "insert into root.t1.wf01.wt01(timestamp, status, type, grade) values (2000, false, 2, 2000)");

            try (ResultSet resultSet1 =
                         statement.executeQuery("select count(status) from root.t1.wf01.wt01")) {
                resultSet1.next();
                // type of r1 is INT64(long), test long convert to int
                int countStatus = resultSet1.getInt(1);
                Assert.assertEquals(2L, countStatus);
            }

            try (ResultSet resultSet2 =
                         statement.executeQuery("select type from root.t1.wf01.wt01 where time = 1000 limit 1")) {
                resultSet2.next();
                // type of r2 is INT32(int), test int convert to long
                long type = resultSet2.getLong(2);
                Assert.assertEquals(1, type);
            }

            try (ResultSet resultSet3 =
                         statement.executeQuery("select grade from root.t1.wf01.wt01 where time = 1000 limit 1")) {
                resultSet3.next();
                // type of r3 is INT64(long), test long convert to int
                int grade = resultSet3.getInt(2);
                Assert.assertEquals(1000, grade);
            }
        } catch (SQLException e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    public void columnTypeTest() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {

            try (ResultSet resultSet = statement.executeQuery("select status from root.sg.dev")) {
                Assert.assertTrue(resultSet.next());
                ResultSetMetaData metaData = resultSet.getMetaData();
                assertEquals(2, metaData.getColumnCount());
                assertEquals("Time", metaData.getColumnName(1));
                assertEquals(Types.TIMESTAMP, metaData.getColumnType(1));
                assertEquals("TIME", metaData.getColumnTypeName(1));
                assertEquals("root.sg.dev.status", metaData.getColumnName(2));
                assertEquals(Types.VARCHAR, metaData.getColumnType(2));
                assertEquals("TEXT", metaData.getColumnTypeName(2));
            }

        } catch (SQLException e) {
            e.printStackTrace();
            fail(e.getMessage());
        }
    }

    @Test
    public void emptyQueryTest1() {
        String expectedHeader = ColumnHeaderConstant.TIME + ",";
        resultSetEqualTest("select * from root.sg1.d1", expectedHeader, emptyResultSet);
    }

    @Test
    public void emptyQueryTest2() {
        String expectedHeader =
                ColumnHeaderConstant.TIME
                        + ","
                        + "root.t1.wf01.wt02.grade,"
                        + "root.t1.wf01.wt02.temperature,"
                        + "root.t1.wf01.wt02.type,"
                        + "root.t1.wf01.wt02.status,";
        resultSetEqualTest("select * from root.t1.wf01.wt02", expectedHeader, emptyResultSet);
    }

    @Test
    public void emptyShowTimeseriesTest() {
        String expectedHeader =
                ColumnHeaderConstant.TIMESERIES
                        + ","
                        + ColumnHeaderConstant.ALIAS
                        + ","
                        + ColumnHeaderConstant.DATABASE
                        + ","
                        + ColumnHeaderConstant.DATATYPE
                        + ","
                        + ColumnHeaderConstant.ENCODING
                        + ","
                        + ColumnHeaderConstant.COMPRESSION
                        + ","
                        + ColumnHeaderConstant.TAGS
                        + ","
                        + ColumnHeaderConstant.ATTRIBUTES
                        + ","
                        + ColumnHeaderConstant.DEADBAND
                        + ","
                        + ColumnHeaderConstant.DEADBAND_PARAMETERS
                        + ",";
        resultSetEqualTest("show timeseries root.sg1.**", expectedHeader, emptyResultSet);
    }

    @Test
    public void emptyShowDeviceTest() {
        String expectedHeader =
                ColumnHeaderConstant.DEVICE + "," + ColumnHeaderConstant.IS_ALIGNED + ",";
        resultSetEqualTest("show devices root.sg1.**", expectedHeader, emptyResultSet);
    }

    @Test
    public void timeWasNullTest() throws Exception {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {

            // create timeseries
            statement.execute(
                    "CREATE TIMESERIES root.sg1.d1.s1 WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY");
            statement.execute(
                    "CREATE TIMESERIES root.sg1.d1.s2 WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY");
            statement.execute(
                    "CREATE TIMESERIES root.sg1.d1.s3 WITH DATATYPE=INT64, ENCODING=RLE, COMPRESSOR=SNAPPY");

            for (int i = 0; i < 10; i++) {
                statement.addBatch(
                        "insert into root.sg1.d1(timestamp, s1, s2) values(" + i + "," + 1 + "," + 1 + ")");
            }

            statement.execute("insert into root.sg1.d1(timestamp, s3) values(103, 1)");
            statement.execute("insert into root.sg1.d1(timestamp, s3) values(104, 1)");
            statement.execute("insert into root.sg1.d1(timestamp, s3) values(105, 1)");
            statement.executeBatch();
            try (ResultSet resultSet = statement.executeQuery("select * from root.**")) {
                ResultSetMetaData metaData = resultSet.getMetaData();
                int columnCount = metaData.getColumnCount();
                while (resultSet.next()) {
                    for (int i = 1; i <= columnCount; i++) {
                        int ct = metaData.getColumnType(i);
                        if (ct == Types.TIMESTAMP) {
                            if (resultSet.wasNull()) {
                                fail();
                            }
                        }
                    }
                }
            }
        }
    }

    @Test
    public void emptyLastQueryTest() {
        String expectedHeader =
                ColumnHeaderConstant.TIME
                        + ","
                        + ColumnHeaderConstant.TIMESERIES
                        + ","
                        + ColumnHeaderConstant.VALUE
                        + ","
                        + ColumnHeaderConstant.DATATYPE
                        + ",";
        resultSetEqualTest("select last s1 from root.sg.d1", expectedHeader, emptyResultSet);
    }
}
